Loop-taker for sewing-machines.



. PATENTED MAR. 24-, 1903. W. F. DIAL & G. H. DIMOND. LOOP TAKER FORSEWING MACHINES.

APPLICATION FILED SEPT. 19, 1902.

4 A TTORNE) PETERS co, PuoTaun-w WASH UNITED STATES ATENT OFFICE.

WILBUR F. DIAL AND GEORGE H. DIMOND, OF BRIDGEPORT', CONNECTICUT,ASSIGNORS TO WHEELER & WILSON MANUFACTURING COMPANY, OF BRIDGEPORT,CONNECTICUT, A CORPORATION OF CONNECTICUT.

LOO P-TAKER FOR-SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 723,371, dated March24, 1903.

Application filed September 19, 1902. Serial No. 124,057. (No'modeL) Toall whom it may concern.-

Be it known that we, WILBUR F. DIAL and GEORGE H. DIMOND, citizens ofthe United States, residing at Bridgeport, in the county of Fairfieldand State of Connecticut, have invented a certain new and usefulImprovement in Loop-Takers for Sewing-Machines, of which the followingis a full, clear, and exact description.

provide means whereby the contacting surfaces of the bobbin-case andloop-taker of a sewing-machine will be properly lubricated withoutendangering the soiling of the sewingr5 thread and without undue care onthe part of the operator asto frequentoilings. Especially in machinesrunningat high speedsay from three thousand tofour thousand stitches aminute-is it necessary to keep the underzo thread mechanism Welllubricated'and at the same time guard the thread from being soiled. Inthe well-known Wheeler 85' Wilson No. 61 machine the bobbin-case has aradial fin which engages an annular groove in the loop-taker, andlubricant must be supplied to these engaging parts. For purposes ofillustration, but without thereby limiting the applicability of theinvention, the improvement will be described in connection with these 0parts.

The invention comprises a bobbin-case receiver (which in the instanceselected is the grooved loop-taker) having a lubricant-well arrangedrelatively to the part to be lubri- 3 5 cated, so as to deflect thelubricant when the receiver is in motion and permit it to feed when saidreceiver is at rest, thus automatically controlling the feed oflubricant and preventing oversupply, all as will be fully 0 described,and particularly pointed outand claimed.

In the accompanying drawings, illustrating the invention, in the severalfigures of which like parts are similarly designated, Figure 1 4 5 is afront elevation of a portion of the stitchforming mechanism and adjacentparts of a Wheeler & Wilson No. 61 sewing-machine, representing oneadaptation of this invention. Fig. 2 is a rear elevation of thelooptaker of the machine shown in Fig. 1 sup- This invention has for itsmain object to plied with our invention. Fig. 3 is a sectional elevationtaken substantially in the plane of line A B, Fig. 2. Fig. 4 is acrosssection of the loop-taker with the Well-cover detached. Fig. 5 is arear elevation of a portion of the loop-taker with the cover detached.Fig. 6 is a perspective view of the loop-taker having the usualloop-seizing point and castoff and provided with a hinged flange topermit of the removal of the bobbin-case. Fig. 7 is a perspective viewof the cover detached. Fig. Sis a cross-section of part of thelooptaker, showing a modified form of the lubricant-well.

For the purposes of illustration there are herein shown only suchportions of a sewingmachine as are deemed necessary for a properunderstanding of the invention. The particular class of sewing-machinesor the specific construction of loop-taker, bobbin, or bobbin-case arenot essential so long as the combination includes a bobbin-casefrictionally supported within the cavity formed in the loop-taker orother receiver for such bobbin or bobbin-case.

Referring to the drawings, 1 is the bedplate, 2 the needle-bar, 3 theneedle, 4: the presser-bar, 5 the cloth-presser; 6 the throatplate, 7the feed-bar to which the feed-dogs are attached, and 8 is thefeed-lifter, all of which are common to the well-known Wheeler & Wilsonsewing-machine com mercially known as No. 61, and all of such parts maybe as herein illustrated and described or of any other usual or approvedconstruction.

The loop-taker 9 is provided with an annular groove 10 for'the receptionof the fin 11, Figs. 1 and 3, formed on the periphery of the bobbin-case12. When the loop-taker and bobbin-case are in operative position, as

ation of the machine when running at high speed that thefrictionally-engaged surfaces of the two should be kept properlylubricated and without endangering the soiling of the sewing-thread. Tomeet these requirements, we have located an oil-well 15 in such relationto the axis of rotation of the loop-taker and to a duct, such as 16,Fig. 4, between the well and the annular groove in the looptaker, thatthe centrifugal force of the rotating loop-taker will cause thelubricant to be held away from said duct and groove; but when suchloop-taker is at rest the lubricant will be delivered through the ductin sufficient quantity to properly lubricate the frictional surfaces, itbeing understood that should the machine be brought to rest with theoil-well uppermost and be left in this position for a considerablelength of time as, for instance, from one day to the nextan excess oflubricant would be delivered to the frictional surfaces; but it is wellknown in the operation of sewing-machines that such superfluouslubricant is quickly and easily removed by running the machine for avery short time-a minute or two0n scrap material, which is the commonmethod employed to clean a loop-taking mechanism when for any reason ithas been excessively oiled. The oil-well is supplied with any suitablepacking 17 in order to hold the lubricant.

As a preferred form of construction of oilwell we have provided theloop-taker with a bore 1 8, which connects with an outer funnelshapedmouth 19, over which is placed a cover 20, leaving an opening 21 for theinsertion of the packing and through which oil is applied, and the bore18 has the duct 16 opening into the annular groove at right anglestoboth.

Fig. 8 illustrates a modified form of construction in which the duct 22between the bore 18 and the annular groove is at the side of the grooveinstead of in line with the periphery of said groove, and while thefirstdescribed construction is preferred the modi fied form might beused with substantially the same beneficial result, and other variationsare possible.

In making the oil-well the larger hole 18 is first drilled within therear wall of the looptaker'a short distance, and the smaller hole withthe cover 20, which is secured within the larger hole 18 by soldering orotherwise. It will be observed that the entrance to the thus-coveredoil-well points inwardly toward the center of the loop-taker, so thatthe oil will be thrown out by centrifugal action.

It will be readily understood that the lubricant contained in thepacking will by the centrifugal force exerted by the rotation of theloop-taker be held at its outermost diameter of rotation and that whensuch loop-taker is brought to rest the lubricant will resume its normalposition in the packing and escape thence through the duct into thegroove 10.

What we claim is'- 1. A bobbin-case receiver, having a lubricant-well,the main body of which is located radially beyond the bobbin-case, sothat in the rotation of the receiver the lubricant in the well will becarried away from the receiver by centrifugal action, and havingcommunication with the receiver and bobbin-case to supply them withlubricant when the receiver is at rest.

2. A bobbin-case, combined with a bobbincase receiver having alubricant-well, the main body ofwhich is located radially beyond thebobbin-case, so that in the rotation of the receiver the lubricant inthe well will be carried away from the receiver by centrifugal action,and having communication with the receiver and bobbin-case to supplythem with lubricant when the receiver is at rest, and also having acover provided with an opening for the introduction of packing and oil.

3. The combination with a bobbin-case, of a rotary loop-taker providedwith a well to contain oil for lubricating the parts of the bobbin-casethat contact with the rotary looptaker, said well having a cover closedtoward the periphery of the loop-taker to prevent the escape of oil fromsaid well due to centrifugal action.

4. The'combination with a bobbin-case, of a rotary loop-taker providedwith a well to contain oil for lubricating the parts of the bobbin-casethat contact with the rotary looptaker, said well formed as a borearranged transversely in the loop-taker, having an outer funnel-shapedmouth and a cover over said month closed toward the periphery of theloop-taker to prevent the escape of oil from said well when theloop-taker is running.

5. A loop taker for sewing machines, grooved to receive a bobbin-case,and having a lubricant-well arranged in its rear and near the periphery,and communicating with the groove, a cover for said well opening towardthe axis of rotation of said loop-taker, and packing material arrangedin said well beneath the cover and accessible through said opening.

In testimony whereof We have hereunto set our hands this 17th day ofSeptember, A. D.

WILB'UR F. DIAL. GEORGE H. DIMOND.

Witnesses:

J. V. MEEKS, F. W. OsrRoM.

ICC

